Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat

Abstract

Abstract: With an aquic brown earth as test soil,this paper studied the effects of urease inhibitor(NBPT),nitrification inhibitor(DCD)and their combinations on the dynamics of soil available N and microbial biomass N.The results showed that the treatments of inhibitors,especially the combined application of NBPT and DCD,could increase soil NH₄⁺-N by 2%～53%,inhibit NH₄⁺ oxidation,decrease soil NO₃^--N concentration,increase soil total available N by 34%～44%,and increase wheat N uptake by 0.26%～6.79%.The best treatment was urease inhibitor combined with nitrification inhibitor.The application of inhibitors increased soil microbial biomass N immobilization at the early growth stage of wheat,and promoted soil N mineralization at filling stage.

Key words: Urease inhibitor, Nitrification inhibitor, Available N, Microbial biomass N, N uptake of wheat

CLC Number:

S143.1

JIAO Xiaoguang, LIANG Wenju, CHEN Lijun, JIANG Yong, WEN Dazhong. Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat[J]. Chinese Journal of Applied Ecology, 2004, (10): 1903-1906.

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